What's the best time in Ramadan to work up in your project while your fasting or after it with your coffee ?

I think after Fajr prayer is the best time, you just finish your Sohour meal and drink your coffee... pray and start.

after Fajr prayer is the best time

I think after having your suhur,immediately after the fajr prayer.cos by that time your energy level is high and your concentration level is high as well.